CANNES, France (AP) — The aging stars of "Youth" are slowly rousing the morning after a late night in Cannes celebrating the premiere of Paolo Sorrentino's latest film. Throughout his career he's chased vibrant new directing talent, from Jane Champion to Quentin Tarantino, Abel Ferrara to Ari Folman. After seeing the Italian director's "Il Divo" and his Oscar-winning "The Great Beauty," he told his agent to get him a part in "Youth." "Youth" is about a retired composer (Caine) staying at a remote Swiss spa where his old friend, a film director (Keitel), is trying to finish a new screenplay. Others are there, too — the composer's daughter (Rachel Weisz), a young actor (Paul Dano) — but the heart of the film, at turns tender and comic, is the friendship between the two men as they wistfully contemplate the end of their lives and their careers in the arts. Keitel's path has rarely stuck to the mainstream, instead hopscotching among vibrantly gritty performances of menace (Mr.